I disagree, I've already mentioned the Guardian account. The Codex says that Thargoid society is made up of hives, and that in general we know basically nothing about them beyond that. Palin and Ram Tah have some information but they're still not part of the group that has the info on the Klaxians.
You can disagree, sure, but then I guess you have a log that says something about Thargoids being divided in at least two factions with the names of those factions, right?
Because you can disagree all you want, but the two factions mentionned in the books are not mentionned anywhere in the game, and that is a fact. "Made up of Hives" doesn't imply different factions, just not a single megahive, nothing else.
And if even Ram Tah and Palin have no info on this, then it's pretty obvious that we'll never hear about them in-game. They already don't tell much anyway ^^
If something was canon, it's still canon until proven otherwise. Premonition was certainly canon, the Klaxians and the Club are official Frontier lore provided for the writing of that book, with its supporting storylines visible on GalNet and ingame today. I believe that the Klaxians aren't going to show up ingame, but that doesn't mean they're not canon to the narrative. Until we see information that says there is definitely only one group or hive, then Premonition is canon.
And again, never said the opposite. I said and implied that even if they appeared in books and are canon to the universe, if the informations we got in these books are reliable of course, nothing has ever pointed in this direction in-game during 8 years and that it should be forgotten and ignored as soon as it becomes a part of any theory concerning in-game events.
Canon? Sure. Abandonned and irrelevant? Indeed ^^
They never had any importance outside that book, they were never mentionned outside that book, nothing even hinted at their possible existence outside that book...
Also, two factions? Just two, in a millions year-old species with enough individuals to not respond when dozens of them get killed...